4292721 has 12 divisors (see below), whose sum is σ = 6565572. Its totient is φ = 2693376.

The previous prime is 4292719. The next prime is 4292723. The reversal of 4292721 is 1272924.

It is an interprime number because it is at equal distance from previous prime (4292719) and next prime (4292723).

It can be written as a sum of positive squares in 2 ways, for example, as 2852721 + 1440000 = 1689^2 + 1200^2 .

It is not a de Polignac number, because 4292721 - 2¹ = 4292719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4292723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13876 + ... + 14181.

It is an arithmetic number, because the mean of its divisors is an integer number (547131).

Almost surely, 2^4292721 is an apocalyptic number.

It is an amenable number.

4292721 is a deficient number, since it is larger than the sum of its proper divisors (2272851).

4292721 is a wasteful number, since it uses less digits than its factorization.

4292721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28080 (or 28077 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 4292721 is about 2071.8882691883. Note that the first 3 decimals coincide. The cubic root of 4292721 is about 162.5215245649.

The spelling of 4292721 in words is "four million, two hundred ninety-two thousand, seven hundred twenty-one".